Absolute thermometry based on Brillouin scattering in gases

Yuting Yang; Marcelo A. Soto; Luc Thévenaz

doi:10.1038/s41377-025-02168-3

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Absolute thermometry based on Brillouin scattering in gases

Original Articles

- Absolute thermometry based on Brillouin scattering in gases
- Absolute thermometry based on Brillouin scattering in gases
- Light: Science & Applications 2026年15卷第2期页码：686-700
- Affiliations：
  
  1.EPFL Ecole Polytechnique Fédérale de Lausanne, Institute of Electrical and Micro Engineering, Lausanne, Switzerland
  2.Department of Electronics Engineering, Universidad Técnica Federico Santa María, Valparaiso, Chile
- Author bio：
  
  Luc Thévenaz (luc.thevenaz@epfl.ch)
- Funds：
- DOI：10.1038/s41377-025-02168-3
  中图分类号：
- 收稿：2025-05-21，
  
  修回：2025-12-05，
  
  录用：2025-12-11，
  
  网络首发：2026-01-12，
  
  纸质出版：2026-02-28
- Accepted：
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Yuting Yang, Marcelo A. Soto, Luc Thévenaz. Absolute thermometry based on Brillouin scattering in gases[J]. Light: Science & Applications, 2026,15(2):686-700.

Yang, Y. T., Soto, M. A. & Thévenaz, L. Absolute thermometry based on Brillouin scattering in gases. Light: Science & Applications, 15, 686-700 (2026).
Yuting Yang, Marcelo A. Soto, Luc Thévenaz. Absolute thermometry based on Brillouin scattering in gases[J]. Light: Science & Applications, 2026,15(2):686-700. DOI： 10.1038/s41377-025-02168-3.

Yang, Y. T., Soto, M. A. & Thévenaz, L. Absolute thermometry based on Brillouin scattering in gases. Light: Science & Applications, 15, 686-700 (2026). DOI： 10.1038/s41377-025-02168-3.

摘要

Abstract

We propose a novel thermometric technique for measuring absolute temperature in gas media based on Brillouin scattering. The method retrieves the temperature from the acoustic velocity of the gas

inferred through the spectral shift experienced by a scattered laser beam during the Brillouin acousto-optic interaction. This approach is inherently contactless

enabling remote sensing applications with high precision. It also exhibits enhanced sensitivity in the cryogenic range and is fully compatible with distributed measurements along recent hollow-core single-mode fibres. This study establishes the theoretical foundations of the technique and provides experimental validation across a range of temperature and pressure conditions. The influence of the gas species on the Brillouin response is analysed

enabling the selection of the optimal gas medium for specific applications. Illustrative distributed measurements demonstrate the strong potential of this technique for cryogenic sensing

where favourable scaling of several parameters leads to significantly improved temperature sensitivity. These results open new avenues for high-accuracy

remote

and minimally invasive thermometric measurements across a wide temperature range

including extreme cryogenic environments.

关键词

Keywords

references

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